Baader 7.5 nm Solar Continuum 1¼" Filter (540 nm)

W A R N I N G

Looking at or near the Sun will cause instant and irreversible damage to your eyes, including blindness. Eye damage is often painless, so there is no warning to the observer that damage has occurred until it is too late. Do not point a telescope or its viewfinder at or near the Sun. Do not look through a telescope or its viewfinder as it is moving.

The full aperture of any instrument that is pointed at the sun must be covered with a proper solar filter or filter/mask combination.

Children and Visitors should be supervised by an adult at all times when partaking in solar observation. Otherwise, keep solar equipment out of a child's and visitors reach to avoid accidental injury.

Please read all manuals before use!

• 7.5 nm Solar Continuum 1¼" Filter, CWL 540nm with 1¼" screw-in thread
• A must for owners of achromatic refractors. This narrowband-filter cuts the spectral range where lens optics draw sharpest and contrastiest. The Solar Continuum Filter brings power back to you.
• Enhances contrast and reduces the effect of atmospheric turbulence (in combination with white light solar filters)
• Enormous contrast gain in monochrome photography even on pure color systems
• Important note: The Solar Continuum Filter must be used for purely VISUAL solar observation ONLY with additional filtering (e.g. Baader Herschel prism or AstroSolar Safety Film)

Baader 7.5nm Solar Continuum Filter – for Visual and Photographic Observations of the Sun

The Solar Continuum Filter is practically a narrow band photosphere filter for solar observation in white light. It provides the highest contrast in the photosphere of the sun. The filter works as a monochromator: suppressing the effects of the atmospheric turbulence and delivering images that are significantly sharper.

Lens systems - including those of apochromats, catadiopters or eyepieces - are traditionally optimized for the spectral range around 540nm, since this is where our eye has the highest sensitivity. This narrowband filter therefore blocks everthing with the exception of the spectral range in which a lens optic works most sharply and with the highest contrast. The effect is greatest on achromatic lens telescopes; but there is also an effect on apochromatic telescopes, catadioptric systems, and even pure mirror systems by reducing air turbulence.

As a monochromatic filter, it is ideal for use on monochromatic cameras and can even provide a tremendous gain on pure color systems.

With a colour camera, as with deep-sky narrow-band photography, it is less effective as only the green pixels are used. Thus, although you still benefit from the improved image sharpness of the telescope that is optimised for green wavelengths (and the reduction of the influences of air turbulence), with a colour camera you cannot fully exploit the better image quality compared to monochrome cameras, as you are effectively working with reduced camera resolution.

The Baader 7.5 nm Solar Continuum also offers all the advantages of the CMOS-optimized Baader filters:

• Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
• Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
• Identical filter thickness to existing standards, with utmost care for parfocality
• Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter
• Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)
• Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment

Important information for Solar Observing

For purely VISUAL observation, the Solar Continuum filter must ONLY be used in combination with our Herschel wedge with an additional ND3 filter or alternatively with the AstroSolar Safety Film (ND 5.0). The Solar Continuum must always be installed behind the actual solar filter.

The combination of AstroSolar photographic film (ND 3.8) and Solar Continuum filter or the photographic ND filters of the Herschel wedge must only be used for photographing the sun at the highest magnifications. These weakers must only be used to achieve very short exposure times with a camera, and thus to minimise the influence of air turbulence. AstroSolar photo film (ND 3.8) is also not suitable for mounting directly in front of a camera lens. The resulting image brightness is much too high.

Technical Data

• Optical Specifications
  - AR-Coating: Reflex-Blocker™ hard coated
  - planeoptically polished
  - CWL (Central Wavelength): 540 nm
  - HBW (Halfbandwidth): 7.5 nm
  - Transmission Range: 535 – 545 nm
  - Type of Filter: Narrowband
• Mechanical Specifications
  - Filter mounted: Mounted (LPFC 6 mm)
  - Filter shape: round
  - Filter size: 1.25 inch
  - Filter Thickness (without cell): 2 mm

Scope of Delivery

• Baader 7.5 nm Solar Continuum 1¼" Filter (540 nm)
• Baader Filter-Box

Legend:

• 1¼" = Filterthread M28.5mm
• 2" = Filterthread M48mm
• nm = Nanometer (bandwidth/FWHM)